Solarized by Ethan Schoonover

Solarized is a great color scheme for text display and editing on a computer screen. The great thing about the theme is that the colors work both on the specified dark background and the specified light background. The original distribution did not have a TextMate theme file, but I found a fork on github that has one.

The main Solarized page does a great job of documenting all features of the color theme, showing that the theme does not only look good, but that it designed with readability in mind. A really beautiful piece of art!